摘要:
In the television broadcasting system called letter box method, it is proposed to transmit an image having a larger aspect ratio than that of the existing broadcasting system by using some of the scanning lines of the existing broadcasting system, and transmit some additional information signal in the remaining portion. An offset value applied to the additional information signal at the transmission side must be removed completely at the reception side. Accordingly, at the reception side, in the scanning line in which an offset reference signal indicative of the offset value is transmitted, the offset reference value and a DC level reference value of the scanning line are detected, and these values are retained until a next offset reference signal is detected. By detecting a DC level of a scanning line containing the additional information signal, a difference from the DC level reference value previously detected and retained is obtained, and the offset reference value detected and retained previously is corrected by this difference. Thus obtained offset value is subtracted from the transmitted additional information signal.
摘要:
A television signal processor which is compatible with the existing television systems and is capable of producing television signals having a larger aspect ratio than the standard aspect ratio has an arrangement such that, at the transmission side, a main signal and a multiplex signal are produced from an electrical signal obtained by receiving an original image through processes such as time-axis compression, time-axis expansion, and chrominance signal processing, and are subjected to non-time-axis multiplexing. The processor has a further arrangement such that, at the reception side, there are provided a circuit for separating the non-time-axis multiplexed signal, a circuit for separating a luminance signal and a chrominance signal, a circuit for demodulating the chrominance signal, a circuit for effecting time-axis compression, a circuit for time-axis expanding the time-axis multiplexed signal, and a circuit for time-axis compressing the non-time-axis multiplexed signal. A receiver provided with this processor may receive images broadcast under the existing television systems without troubles and also may reproduce TV images with a larger aspect ratio than the conventional 4:3 aspect ratio by the application of synchronous detection, time-axis compression, time-axis expansion, etc.
摘要:
A main signal motion detection signal and a multiplex motion detection signal are processed to obtain a compensated motion detection signal. This signal is a motion detection signal for a portion other than a portion having an aspect ratio of 4:3. Thus, a television signal processor is provided which eliminates quality differences between images in the portion having an aspect ratio of 4:3 and images in the other portion having a different aspect ratio.
摘要:
Disclosed are multiplex television signal processing apparatuses in a television signal transmitting and receiving system. An apparatus at the transmitting side comprises: a signal separator to separate a multiplex signal into a first and a second part; a time-multiplexer to time-multiplex a main television signal and the first part of the multiplex signal to obtain a time-multiplexed main signal; a first amplitude-modulator for modulating a first carrier by the multiplexed main signal to obtain a vestigial side band signal, amplitude-modulated main signal; a second amplitude-modulator for modulating a second carrier which is same in frequency as but different in phase by 90 degrees from the first carrier by a second multiplex signal; an inverse Nyquist filter for filtering this signal to obtain a vestigial side band, amplitude-modulated multiplex signal; and an adder for adding the vestigial side band, amplitude-modulated main and multiplex signals to obtain a multiplexed signal.An apparatus at the receiving side comprises: a Nyquist filter for filtering the multiplexed signal; a carrier regenerator for regenerating the first and second carriers from the multiplexed signal; a main signal detector for detecting the main signal from the multiplexed signal passed through the Nyquist filter by using the first carrier; a filter for removing quadrature distortion from the multiplexed signal; a multiplex signal detector for detecting the first multiplex signal from the multiplexed signal passed through the filter by using the second carrier; a time-demultiplexer to time-demultiplexing the main signal into a main television signal and a second multiplex signal; and a signal composer for composing the first and second multiplex signal to obtain the original multiplex signal.
摘要:
A wide-screen TV signal transmission apparatus includes transmitting a wide-screen TV signal generator for generating a wide-screen TV signal source; a scanning line converter for down-converting a wide-screen TV signal with an integer conversion ratio to obtain a conventional TV-compatible signal with upper and lower black bars; a vertical augmentation signal generator for generating a vertical augmentation signal to enhance the vertical resolution at the receiving side of the transmission apparatus; and adder for adding; a conventional TV-compatible signal and a vertical augmentation signal to obtain a conventional TV-compatible composed signal; and a transmitter for transmitting a conventional TV-compatible composed signal. The wide-screen TV signal transmission apparatus includes, in its receiving side a video signal detector for detecting a video signal from a transmitted modulated conventional TV-compatible composed signal to obtain a base-band video signal; a signal separater for separating the base-band video signal into luminance and chrominance signals with upper and lower black bars; a scan-convertor for up-converting the luminance and chrominance signals with upper and lower black bars into luminance and chrominance signals without upper and lower black bars with as integer conversion ratio; a vertical augmentation signal processor for recovering the vertical augmentation signal; an adder for adding luminance and chrominance signals without upper and lower black bars and the vertical augmentation signal to obtain a wide-screen TV signal with a high vertical resolution; and a display device for displaying the wide-screen TV signal with a high vertical resolution.
摘要:
A multiplex TV signal processing apparatus in a television signal transmitting and receiving system includes an apparatus at the transmitting side which has a first amplitude-modulator for modulating a first carrier by a main signal to obtain a vestigial side-band amplitude-modulated main signal; a second amplitude-modulator for modulating a second carrier but whose frequency is the same as which phase is 90 degree different from the first carrier by a sub signal to obtain a carrier suppressed amplitude-modulated signal; a first inserter for inserting a first ghost canceling reference signal into a horizontal line of the main signal during a vertical blanking period; a second inserter for inserting a second ghost canceling reference signal into the same horizontal line of the sub signal as the first ghost canceling reference signal; and includes an apparatus at the receiving side which has: a first demodulator for demodulating the main signal; a second demodulator for demodulating the sub signal; a ghost canceler for canceling a ghost of the sub signal using the second ghost canceling reference signal; and a crosstalk canceler for canceling the crosstalk of the sub signal from the main signal using the first ghost canceling reference signal.
摘要:
In a multiplex signal processing apparatus, in the band of a demodulated signal in which a carrier is amplitude-modulated in a vestigial side band by a main signal, another carrier is superposed which is identical in frequency to the first carrier but different in phase by 90.degree. is amplitude-modulated its double side bands by a multiplex signal which is different from the main signal and which is formed into a vestigial side band signal by a nyquist filter. At least either the frequency or polarity of the multiplex signal is inverted on the transmission side by a multiplier, an oscillator and a filter. At least either the frequency or polarity of the multiplex signal is inverted on the reception side by a multiplier, an oscillator and a filter. The reception side has a crosstalk reduction filter for removing crosstalk from the main signal to the multiplex signal.
摘要:
A multiplex signal processing apparatus in a signal transmitting and receiving system includes at the transmitting side: a first amplitude-modulator for modulating a first carrier by a main signal to obtain a vestigial sideband, amplitude-modulated main signal; a second amplitude-modulator for modulating a second carrier which has the same frequency but differs in phase by 90.degree. from the first carrier by a multiplex signal to obtain a double sideband, amplitude-modulated multiplex signal; an inverse Nyquist filter for filtering this signal to obtain a vestigial sideband, amplitude-modulated multiplex signal; and an adder for adding the vestigial sideband, amplitude-modulated main and multiplex signals to obtain a multiplexed signal. The apparatus at the receiving side includes: a Nyquist filter for filtering the multiplexed signal; a carrier regenerator for regenerating the first and second carriers from the multiplexed signal; a main signal detector for detecting the main signal from the multiplexed signal passed through the Nyquist filter by using the first carrier; a filter for removing quadrature distortion from the multiplexed signal; and a multiplex signal detector for detecting the multiplex signal from the multiplexed signal passed through the filter by using the second carrier. By inverse Nyquist filtering the auxiliary signal in quadrature to the picture carrier, a normal synchronous receiver will produce a conventional television signal without distortion (crosstalk) caused by quadrature distortion of an auxiliary signal containing additional picture information while at the same time allowing relatively simple demodulation of the auxiliary signal in improved receivers without adding distortion.
摘要:
A multiplex signal processing apparatus in a singal transmitting and receiving system includes at the transmitting side: a first amplitude-modulator for modulating a first carrier by a main signal to obtain a vestigial sideband, amplitude-modulated main signal; a second amplitude-modulator for modulating a second carrier which has the same frequency but differs in phase by 90.degree. from the first carrier by a multiplex signal to obtain a double sideband, amplitude-modulated multiplex signal; an inverse Nyquist filter for filtering this signal to obtain a vestigial sideband, amplitude-modulated multiplex signal; and an adder for adding the vestigial sideband, amplitude-modulated main and multiplex signals to obtain a multiplexed signal. The apparatus at the receiving side includes: a Nyquist filter for filtering the multiplexed signal; a carrier regenerator for regenerating the first and second carriers from the multiplexed signal; a main signal detector for detecting the main signal from the multiplexed signal passed through the Nyquist filter by using the first carrier; a filter for removing quadrature distortion from the multiplexed signal; and a multiplex signal detector for detecting the multiplex signal from the multiplexed signal passed through the filter by using the second carrier. By inverse Nyquist filtering the auxiliary signal in quadrature to the picture carrier, a normal synchronous receiver will produce a conventional television signal without distortion (crosstalk) caused by quadrature distortion of an auxiliary signal containing additional picture information while at the same time allowing relatively simple demodulation of the auxiliary signal in improved receivers without adding distortion.
摘要:
A method for producing nickel nanoparticles is described, including a first step of heating a mixture of a nickel carboxylate with 1-12 carbon atoms in its moiety excluding —COOH and a primary amine to obtain a complexed reaction solution with a nickel complex foiiiied therein, and a second step of heating the complexed reaction solution by a microwave to obtain a Ni-nanoparticle slurry. In the first step, the heating is preferably conducted at a temperature of 105-175° C. for 15 minutes or longer. In the second step, the heating is preferably conducted at a temperature of 180° C. or higher.